Hey all,
I'm looking for a little advice. I found an old Apple iPod HiFi at a thrift store for cheap and I'm looking to remove the ancient 30pin FW connector and install a small piCorePlayer+DAC inside the box.
The stock HiFi power supply outputs the following:
+17V (1.6A)
+6V (0.3A)
+3.3V (0.1A)
The +17V current drops to 0.5A when using 7.5-9.9V (5A) DC input (aka D-cell batteries) but I don't ever envision using this.
The RPi Zero W requires 5V and about 200mA.
I don't have a scope but I imagine the stock DC is quite clean. In the past I've used a cheap switch mode power supply but, being audio, I worry that these will be too noisy without me designing suppression (shudder... zener, inductors and capacitors and shielding). Did I mention I don't have a scope at home? I doubt I'm the first two encounter this issue and, before I dust off textbooks and think hard about it, I figured I'd post and ask if anyone knows of an off-the-shelf board or design suitable for cleanly knocking down the 17V line?
I'm looking for a little advice. I found an old Apple iPod HiFi at a thrift store for cheap and I'm looking to remove the ancient 30pin FW connector and install a small piCorePlayer+DAC inside the box.
The stock HiFi power supply outputs the following:
+17V (1.6A)
+6V (0.3A)
+3.3V (0.1A)
The +17V current drops to 0.5A when using 7.5-9.9V (5A) DC input (aka D-cell batteries) but I don't ever envision using this.
The RPi Zero W requires 5V and about 200mA.
I don't have a scope but I imagine the stock DC is quite clean. In the past I've used a cheap switch mode power supply but, being audio, I worry that these will be too noisy without me designing suppression (shudder... zener, inductors and capacitors and shielding). Did I mention I don't have a scope at home? I doubt I'm the first two encounter this issue and, before I dust off textbooks and think hard about it, I figured I'd post and ask if anyone knows of an off-the-shelf board or design suitable for cleanly knocking down the 17V line?